diff --git a/docs/cookbook.md b/docs/cookbook.md
index 5a2b26a2..c31e2319 100644
--- a/docs/cookbook.md
+++ b/docs/cookbook.md
@@ -25,9 +25,9 @@
                     <span style="font-weight: normal;">
                         apply coupon for discount: 
                     </span>
-                    2F6C6BE01B8940D3E457
+                    C967880E71496470E40E
                 </div>
-                <button style="margin: 0 auto; display: block; width: 200px; height: 70px; border-radius: 14px; border: none; padding: 10px; font-size: 18px; background-color: #357296; color: white; cursor: pointer;" onclick="window.open('https://www.udemy.com/course/pysimplegui/?couponCode=2F6C6BE01B8940D3E457','_blank');">
+                <button style="margin: 0 auto; display: block; width: 200px; height: 70px; border-radius: 14px; border: none; padding: 10px; font-size: 18px; background-color: #357296; color: white; cursor: pointer;" onclick="window.open('https://www.udemy.com/course/pysimplegui/?couponCode=C967880E71496470E40E','_blank');">
                     click here to visit course page
                 </button>
             </div>
@@ -2664,7 +2664,7 @@ def convert_to_bytes(file_or_bytes, resize=None):
     if resize:
         new_width, new_height = resize
         scale = min(new_height/cur_height, new_width/cur_width)
-        img = img.resize((int(cur_width*scale), int(cur_height*scale)), PIL.Image.LANCZOS)
+        img = img.resize((int(cur_width*scale), int(cur_height*scale)), PIL.Image.ANTIALIAS)
     bio = io.BytesIO()
     img.save(bio, format="PNG")
     del img
@@ -2747,7 +2747,7 @@ def convert_to_bytes(file_or_bytes, resize=None):
     if resize:
         new_width, new_height = resize
         scale = min(new_height/cur_height, new_width/cur_width)
-        img = img.resize((int(cur_width*scale), int(cur_height*scale)), PIL.Image.LANCZOS)
+        img = img.resize((int(cur_width*scale), int(cur_height*scale)), PIL.Image.ANTIALIAS)
     bio = io.BytesIO()
     img.save(bio, format="PNG")
     del img
diff --git a/docs/readme.md b/docs/readme.md
index e73b6075..2f5ece73 100644
--- a/docs/readme.md
+++ b/docs/readme.md
@@ -9,8 +9,8 @@
       <img src="https://www.dropbox.com/s/6wzf3ebmj97v4zs/PySimpleGUI-GitHub-Udemy-Course.png?raw=1" width=200 alt="PySimpleGUI Udemy Course">
     </td>
     <td>
-      <h5>apply coupon for discount:<br>2F6C6BE01B8940D3E457</h6>
-      <a href="https://www.udemy.com/course/pysimplegui/?couponCode=2F6C6BE01B8940D3E457">click here to visit course page</a>
+      <h5>apply coupon for discount:<br>C967880E71496470E40E</h6>
+      <a href="https://www.udemy.com/course/pysimplegui/?couponCode=C967880E71496470E40E">click here to visit course page</a>
     </td>
   </tr>
 </table>
diff --git a/readme.md b/readme.md
index e73b6075..2f5ece73 100644
--- a/readme.md
+++ b/readme.md
@@ -9,8 +9,8 @@
       <img src="https://www.dropbox.com/s/6wzf3ebmj97v4zs/PySimpleGUI-GitHub-Udemy-Course.png?raw=1" width=200 alt="PySimpleGUI Udemy Course">
     </td>
     <td>
-      <h5>apply coupon for discount:<br>2F6C6BE01B8940D3E457</h6>
-      <a href="https://www.udemy.com/course/pysimplegui/?couponCode=2F6C6BE01B8940D3E457">click here to visit course page</a>
+      <h5>apply coupon for discount:<br>C967880E71496470E40E</h6>
+      <a href="https://www.udemy.com/course/pysimplegui/?couponCode=C967880E71496470E40E">click here to visit course page</a>
     </td>
   </tr>
 </table>